ZF 4143.352.030 SUPPORTING RING | OEM Genuine Part

Overview

The ZF 4143.352.030 SUPPORTING RING is a precision-engineered OEM genuine component designed to maintain axial alignment and distribute load evenly within the clutch pack assembly of ZF heavy-duty transmissions. This hardened steel ring sits between the clutch housing and the piston return spring, preventing metal-to-metal contact and ensuring consistent hydraulic pressure application. As a critical wear interface, the SKU 4143.352.030 directly influences shift quality and torque transfer efficiency. When paired with a new 4143101016 HOUSING and 4143301039 HOUSING, this supporting ring restores factory-spec clearance tolerances in the HL 100 and HL 270 series gear sets.

Symptoms of Failure

• Intermittent gear slipping under load: A worn supporting ring allows the clutch pack to shift axially, reducing clamping force and causing torque loss during acceleration.
• Low hydraulic pressure warnings: Deformation of the ring creates internal leakage paths, triggering pressure drop alerts on the TCU (transmission control unit).
• Metallic debris in transmission fluid: Surface spalling from the supporting ring contaminates the oil circuit, often requiring simultaneous replacement of the 0501318136 GASKET and 0636101084 CAP SCREW to prevent secondary damage.
• Harsh or delayed shifts: Uneven ring wear disrupts the balance between clutch apply and release, producing jarring engagements in forward and reverse gears.

Technical Specifications

Compatibility

This supporting ring is engineered for the HL 100 and HL 270 series transmission families, which include the ZF WG180, WG200, and WG210 models. It also fits select 6HP and 8HP automatic transmissions used in off-highway equipment and municipal vehicles. Always verify fitment by cross-referencing your transmission serial number with the SKU 4143.352.030. For complete rebuilds, order the 0750108044 PLUG and 0636302014 SCREW PLUG to seal hydraulic passages during reassembly.

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